Annihilation cross sections and interaction couplings of the dark matter candidates in the warped and flat extra dimensions

TL;DR

This paper investigates dark matter candidates arising from scalar fields in warped and flat extra dimensions, analyzing their annihilation cross sections and interaction couplings, with implications for observable signals depending on extra-dimensional parameters.

Contribution

It introduces new dark matter models involving scalar fields in extra dimensions and studies their annihilation properties and couplings in warped and flat geometries.

Findings

Annihilation cross section is highly sensitive to the scalar's localization parameter.

Effective couplings range from 10^{-6} to 10^{-1} depending on resonance proximity.

KK modes of the Higgs field significantly influence dark matter interactions for large compactification radii.

Abstract

We consider a scenario with an additional scalar standard model singlet $\phi_S$, living in a single extra dimension of the RS1 background. The zero mode of this scalar which is localized in the extra dimension is a dark matter candidate and the annihilation cross section is strongly sensitive to its localization parameter. As a second scenario, we assume that the standard model Higgs field is accessible to the fifth flat extra dimension. At first we take the additional standard model singlet scalar field as accessible to the sixth extra dimension and its zero mode is a possible dark matter candidate. Second, we consider that the new standard model singlet, the dark matter candidate, lives in four dimensions. In both choices the KK modes of the standard model Higgs field play an observable role for the large values of the compactification radius $R$ and the effective coupling \lambda_{S} is of the order of 10^{-2}-10^{-1} (10^{-6}) far from (near to) the resonant annihilation.